SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e5d45911ff5176c49e9f4078c1f9475cede85ff98fb8577d2be771ead2bb741' 
  AND token = 'PqEJRIf/r1VnUDcyzjsrZqIe+vowNNu30NmQzBo3mjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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