SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4befeaabe84d2c2e4d2edbb27328202c24a6799870162125578d0630f7b80e3c' 
  AND token = '8uUJ+GegHhyjZ1Jfc8VBr9QBmJHGSL7w/+qEpWKnK7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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