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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd172d10cf5d4c250e0fc1492c443d0e9c6b7dce99d43b5caf35dba31105e9951' 
  AND token = 'H9g0/bMEigRAofTk7TUB02cP67zH7Iut52mD3eW/LL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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