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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '773d951fa73caf7ec129b76ef2bc7779f2d53ecdce5a1af55c84d84fcac73f57' 
  AND token = 's7o2XGwzXDnRhc5m44B+SyoVz4fx9wY2H1Uj8x4wKJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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