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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc9edbec445dbf137e9f71d61f35e8c612c96967b6012a4ac487468b81dc7214' 
  AND token = 'CPSC8Q+WXs7eJNNMNi34aLseC1Wked1/J0ojvcp4c6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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