SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b5e8a79cb838046d4b0432af3d9e315caa10b617cd3290dba2ce1d6edd00c2c' 
  AND token = 'jOagjNqWvxLesGo1p1f2A/O/+zrRQU4t8yUYEqJK80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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