SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8192ac56dfe5b876aa93848426e740226063c1ad1f0094885ec4842d0beb42a3' 
  AND token = 'EDYAxwiaK1dM+Uf+I/JIV+qlxjrb/VvmbiOUskZ07Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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