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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34176c2651bea50135c5115f400d7c458e2882af6f4f3df964705f04bc501aed' 
  AND token = 'WMNea9RgEN8bdu1iUETn7oif3stYc+bUEoah50xGn2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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