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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60111036829f302dfa0e93f2e58509166b1bf3cf8a226704ab5210d01e099144' 
  AND token = 'jxXlXVW0o9eSVGZEzccTHSsGVNWfICX2+0G2bKvE+LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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