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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f6fa50b6b7c0c0107050f58a2c3ed3bb3d224be6ddb1d3e326d47d433b600be' 
  AND token = 'bGjcNeqAqG0qcEZ5WgcnnxxDydI7GaE6BQ7ImA84w78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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