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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '688bc2a36699597307f1268477fc4ba3aa70f922a85f086fc08c826f68ccd5a6' 
  AND token = 'SD2epioermfnNPCSMkFD6XpJAZ/5X5DjespAJSnNmh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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