Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9f23f7e944383393ae6022a4830fb4564bdfd12e7b4ba514af0f3936c11c64a' 
  AND token = '5UUZCz9DFqkqfveEerojc5zjkGuo5q4tT8NKEOdR/nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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