SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6a5c6216ad037e5029358233db35455170dd34a597245a3c6fe1f9826a2921' 
  AND token = 'i7WDuvwhQDB8Hrpe9CZDqI1Qjg/X/tFeBLpQS8hInaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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