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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aff1ba43e0ceca93a13a2a65d7bb1138c343693fa4fa0e729e1bd44e422eaa7d' 
  AND token = '1TS+ZBnvhohW07f2rR8Twd00m9uAJErPghiUg6z/epc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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