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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540b3a78859b15d92f2eeaed56b226629e5097618020c466df94366737c83cf5' 
  AND token = 'Sx7KxyFeQ9xa6ZYU4IgSk46nz9OsjjnNUO7LiuJ+9uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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