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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7f2732a7a658d00b302034826539ab8a24be38618a32e05864be63a6c0d47f3' 
  AND token = 'XPUoHvmLapZMIkuuI2cf4O5sZSDUU31hb1538L15yzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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