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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da7b953d965891fa34260dfa3eb7d8ec2679f3dcbc5c987b7170373798cbdfa1' 
  AND token = 'tWauiamGuvpxfaHjWJG6dF8FSPDLB9i2wmcnu8mqBwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}