Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a1718aa56d6e81d140a89013baae4dce6ab7a0b1a0230add9dd2b73ea4f71a6' 
  AND token = 'KJ4ECBrLNzuW9/vhFSxLpj/MeFxv2GeMuzrCkoE5mas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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