SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16a38bb73ee71614b2f0fd60be879f33b1fe6846f5e7842d11e0b270521b4d60' 
  AND token = 'Drvt8CsjGb/GjwbHKtxZRX9zZAAIYCvgbZfV80hs3Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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