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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d948858b66b4291081d3043facb9d5e20ff5151e02ab96836a97bfe1b57723f' 
  AND token = 'L6BFegD5DZagvEfNk1ZuyWH/b4HbWd/TCba44yKDTs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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