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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab55b878cdb2b735bde324706daf8897f411722405ad4dbd5c4c82e22f0ea4b2' 
  AND token = 'zZV3pZMBLsLQ9WyI04FQr/doQT4xjf4BNhLvnEuaN0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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