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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abbce52b4f1a3d4f0d268290652488701f0c6c24c71bb5db9f54013b19e0a7ba' 
  AND token = 'A6BhBOdDhiMW8co2l8nDmMTw1CttKqVCm09YM8a1GNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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