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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e938654d096c7f2de519e6cb513efd24839635e94b3d7438df24ad1f3c9ffb7' 
  AND token = 'slAs6kxNvdKxthkgKzak5wDatED1r2viHG8BuYv8mIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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