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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cdf8d67ebf704f785a23b4ec58f9d7fde2247e8b3f2aec5229e853710c71816' 
  AND token = 'gN2izUQOVTbYwKb6O7c9t+qPpEyTTqEpaTI+dgB8djM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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