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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f1f37d459250ef826cd878a7749ab512fccfbc49b3e344ec266238256a57260' 
  AND token = 'k1knXgS9DgIYHR1nLtCjg8w4V7n58IO2FtXcQJxYrW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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