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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a47d06505eab40e56dc057f8a4179ee772c47cbab6356236030dc8de0842ead6' 
  AND token = 'dhhlylJd9se4me7syYT/yCrPRbBl/jWY4I7jB6ZbzYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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