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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f605b3ec2bbf34d4a0cb04f07e5b70ed46ae7497b6da2c873c1c76f9e08de567' 
  AND token = 'WtRFrEhZPE4VnDttJU57iwlwjxGC0Q4OUqTPN2ySa/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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