SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73adc4591ffd63109e45f244d0c85a46e8300a6973f17cf421db28478cbb1b24' 
  AND token = 'HmA1FXHgchxDcoVPtCGsytVBTqLdgTlE72n9T8zr9Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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