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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78b508e54ac1b6e8bbf78f4f9fda8164b989e6ead0f3fc09a43914f3a88d837d' 
  AND token = 'n53AqN0UaG1J19Hq/WLEzn5tTQR8/+DNoFK+tiewuD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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