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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd48137c974205fa34aa63f35aa0426ea9d559163ea73c463f07d2e0eb4e493a' 
  AND token = 'tdJqditm/3lcIQmrrAx6taHke3985iOUZgN2n+6OYLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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