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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '052309137a53b3882907bef51d20bf08fa51cccf70e6c48b3bb176ab45bc8575' 
  AND token = 'WLUYpQtYfQO+nqQs0HuDZQL54atCSDfv8RNBkCEZYTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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