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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6414f79b2a79639fba7e6b9c5366d902a72a56943e2339dfb556328243fd94a8' 
  AND token = '2UQfYME3zMTma5K0K43JLGKpGMYeOEQHZhk4TBt535o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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