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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65112bcd5de1f4cf03bca51e41089c90ea20d59e88b88de9c957b8e047480ea7' 
  AND token = 'IC9J4xOvXvuTsBimtVLXEhRO9s8mXCoEDj0u/vC8brY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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