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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f370a5dae8c847cb6dee80510ffb4dea46864e7583161c516c3b95b3639a0d1' 
  AND token = 'q3L60sjgClh5Rc1o3lx0h9EVvEQnNRrsJunZat0oL3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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