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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6533b94ede41ca3ccf4adc726e761a29aee059f0d8e37a2460cbbe19cb5f2630' 
  AND token = 'kMZThbgS39ahXj7Lk79aod0Hl2FK62PZmkKgR+7DVn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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