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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00987dff2823d23299929656ee9db2ad8b1b795aa87ad8a9cd5158c465f03c25' 
  AND token = 'agW4rGboBica1wtaJVTQG+285w4f4robrTQosXlPDYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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