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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '798f3368dddf187801d74c9856bff91abaf008f27fc5080935facd19d5ca5be2' 
  AND token = 'f+aIzJWZGAL81bqG09o+YwNzWKdOypz011Ei3cqpKu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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