SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6769be60cd17aaf2c8f5db4273bd23cfecca14799b629a6384cc58ea7d7c09a' 
  AND token = '+EcsgtSQlGBDWGv5/TJEpLlzhR2vVvu7DrIgCaHSfv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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