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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aec66e79c9b04d063efb5e7bf34b1174241557362b1b44a21bcf386665435b6' 
  AND token = 'XPom35Qc6gKqTBLNl0abmU9ardrCBuFOt5C8mNURYqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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