SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed269deda545b49c7e7b982e33ccaccd02dec2ac8b43556bae1ccf95a0b21f79' 
  AND token = 'B+tnqlfCigGgBbq3ODzosghFG4MQLVBa5xmTvugeJfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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