SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '632703fd545142b57bae7f2d69f78663b0e5e937ff14ec72b616acbf8a29ddb4' 
  AND token = 'AmGzegfIAVhLnQaly/3GhKaz1Fkwzcm/kvFF88hytu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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