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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '568f819bbaa05245c59d69a5ead2332f9ef83c42d151801b9604802d1a001b14' 
  AND token = '3OaFLUHB9KmQs/9FX2c7xgj9gt3Y6dB5wabIsFUYyjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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