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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb14624c314d6493d141e26c342f96df2ea6ce4408b9eb818b81821d3b9a46e' 
  AND token = 'niBgzK354b0Mu7+3BbotsK3IwXpO8NNSQpXzI2vFstU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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