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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3221d1f24558f7ba0c6ae449cd258d8c4fe8f84ca0dc15ad8b5425e69fe384' 
  AND token = 'Ta/4pbNOUwlqFkO6A1ouBdkOgyuu8wZMtUf5B7LWyRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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