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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b9ddcbab68eab036362d65e9b06a70280e247e42127cd29eeed07502e6050d1' 
  AND token = 'QOXVFcN9qJQRiCfGD2MNjIAdVBN3wL1y8euvR4JZdp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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