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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c48a69f967efc540fedfc19d07b66264bb4e086fbbda6405722f779bc4e8983' 
  AND token = '51TTsbejbY1CLbSn1vVEbhnZkGbOB0/NZv4A2ina6J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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