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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5347dbd8f15a0fb073b1aa0b9c714b24034a06a54792e55d672cb4fea6a84e2b' 
  AND token = 'a/YbxzRlMwUN1eJJ3XmLwtCSQp1QSusDiSCvSvWsfvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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