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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30bb6dafeac923a79c147b4ab4bef5e550aa9f10ff73c174958060b9eb15f834' 
  AND token = 'VSPkJrNdOGmYgy4LFU9d9fMCeT6l7g3Hf9/QAKAiIa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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