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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f6d4edfa753f7b4421c8cd66eb5d8e8f40e54be36a5208b10f84371e2b47d2e' 
  AND token = '9P8uDbyobb2tTZjDVuHCZLUuK9+KIkuntznQaIOPjys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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