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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46bd986bb2fdd6d6f1edec618a3de0d03f2643ea9aa37f2dca54a37c6981cd93' 
  AND token = '/MRrG9yqxmuspdoRinqbX6rOZJ+M7uc4Tt50E/EnFLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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