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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cd9a80d35c637d5c2fa817b7f3dade5b583e10cbe37882bc28caafb7bd8c091' 
  AND token = 'X0PrwPne0YIZferFnpL7H53bfdZT4qDfJednQcW8GTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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