Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68e63bdee5a682ba62b4eefe26e3d40a5134fdb37ba8c60a0e5b24188b7650b2' 
  AND token = 'Hh5T+bDmdajJwl8X7ET7Jv6o1df4KKY0y6ojE0/VdBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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