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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b064f2a57aaac874e0ad3dc6940a592d9a5d43f9e94a5fd25ed409891fd2b588' 
  AND token = 'DR5fToUVtvhDD10kHTxLow7ORnXUxHtwkI7pCvqEsN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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