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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b092eb61657f1ad28e0601998bac3ac14061de246998b8579cf01ab84a844f6' 
  AND token = 'g9mXvvmw9ztss2Vz4Vv2PnWZ5+hs29VU1r0neSnAS7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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