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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ba80280e2fc2167c0c16662f518ddd56a5035620ed91853284fc673769ebd0d' 
  AND token = 's7IB2T72KqOruuaewjfNMu39DA6IC7sr0Q1JufOFF2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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