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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fd5ee2b1ce264265feaec75749bc5380ab60f04f3e64f4457791b93891b1602' 
  AND token = '1kftIYaB0OAoQq/35q9Qd7iQ9KdXjL9DCVUZx8t1YLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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