SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f53e1d6993005f3926ffe0a374629729e09791764b8f286b57d2b6ecf5fe08b0' 
  AND token = 'zcI1UVugiZ/ZWytMGc/X29VvCXZ4Za8h0J3w7slxkK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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