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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b860ee2c984ed8fbf26921de24bd36b762b49962b08c4a587e15d332d15775' 
  AND token = 'sHUe6J5VklxSdWzNzGPrc9HTpXJucoBFSpDFSV2IGu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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